System of distribution.



F. w. MEYER. SYSTEM OF msmsunou. APPLICATION F|LED JAN-11,1913.

1,186,819; j Patented-5 111613; 91

WUNESSES: INVENTOR i GEM/W44 "gmww ATTORNEY 1 UNITED @TATES PATENTOFFICE.

rarnnnrcn w. MEYER, or WILKINSBURG, PENNSYLVANIA, assieivoza T0 WESTING-nousnnnnc'rn'ic aun'manurac runme COMPANY, A conrona'rron orrnnusvnVANIA. I H v nseam I To all whom it may concern Be it known that I,FRIEDRICH 1V. MEYER, a subject of the Emperor of Germany, and a't'isident of \Vilkinsburg, in the county of Allegheny and State ofPennsylvania, have invented anew and useful Improvement in SystemsofDistribution, of which the 'following is a specification.

My invention relates-tosystems of elec trica'l'distribution andparticularly to those in which induction motors are employed for drivingthe loads and are regulated and assisted in their operation by auxiliaryma chines.

The object of my invention is to provide a systemof the characterindicated in which the secondary winding of the induction motor, isconnected to the supply circuit through 'an auxiliaryk machinep that mayserve the several functions of a frequencychanger, ofia-motor 'forassisting-the induction motor in carrying the load, and 0f- 1 means forregulating the speed ot the motor and-compensating the power factor ofthe system. The auxiliary machinehas all of these functions ,by reason.of its peculiar I construction, and because it is mechanically coupledto'the induction motor. I

My invention is illustrated in the accompanyingdrawing, Figure 1 ofwhich is a similarview of a modification of the systemiof'Eig. ,1. v v

The present system comprises an induction motor 'l'that isadapted todrive any suitable-load (not shown), suchas a compressor, hoist orrolling mill, has its primary" winding energy from, a suitable supplycircuit 2, The secondary winding of the induction motor is connectedthrough. slip rings 3 to slip; ringsl constituting a part of thearmature 5 of an auxili'ary'inachine ;6, the said armature being alsoprovided witha com,

j mutator cylinder 7 uponwhich bear brushes 8 that are preferablymaintained stationary.

The armature 5 is mechanically coupled to the secondary -me1nber theinduction motor, p'referablv. by means of suitable re- 9, tli"ough itmay be coupled The auxiliary machine 6; is similar to that of a systemof distribu- 'tion embodying the same, and Fig. 2'is a connected to, andreceives SYSTEM' OF DISTRIBUTION.

Specification of Letters Patent. Patented June 13, 1916; applicationfiled. January 11, 191s. serial No. 741,459.

set forth in another application, SerialNo.

653,380, filed by me on October 7, 1911, and .is provided with a fieldor stator winding having a plurality of phase divisions 10, 11 and 12towhich the commutator brushes 8 are adjustably connected at 13, thepoints of connection being adjustable for the purpose of regulating thevoltage applied to, and the speed of,'the armature 5. The several phasedivisions-of the stator winding -are also connected at 14; to the supplycircuit andto each other at 15 by means of an adjustable connector 16,all of the said points of connection to the stator winding beingadjustable .for. the purpose of adjusting the them, and the speeds ofthe two machines are regulated by so adjusting the points of connectionto the stator winding of the auxiliary machine as to apply the propervoltage to'the armature of the auxiliary machine and the secondarymember of the induction motor. The voltage may be varied by changing theratio of the convolutions of the stator winding between the points of.

connection 13 and 15 thereto respectively of the commutator brushes 8and the connector 16, to the convolutions between the connections at 14and 15 thereto respectively of the supply circuit and the connector 16.The stator winding serves not only as a field .winding, but also asatransformer for establishingthe proper ratio of the voltages betweenthe armature 5 and the supply circuit. The power factor of the inductionmotor and also of: the system, as a whole, maybe compensated by properlyshifting the posi- ,tions of the active portions of the several phasedivisions of the stator winding, which may be accomplished by adjustmentof'th e points of connect-ion 14 and 15 respectively ofthe supplycircuit and of the connector .13 tov the. said winding. -By this means,the

current taken by the induction motor may j' be brought into phasecoincidence with the voltage of thesupply circuit, or maybe caused toassume anyother relation with reform, and a corresponding influence uponthe commutation, maybe avoided.

By reason of the mechanica coupling of the auxiliary mach ne to theinduction motor, the auxiliary machine is enabled to as .sist theinduction motor in carrying its load, and the proportion of the loadcarried by the auxiliary machine may beregulated, by changing the totalnumber of active convolutions in the stator Winding of the auxiliarymachine Without changing the ratio of. voltage transformation eii'ectedby the stator Winding. In other Words, thisregulat'ion may beacconnplishedby so changing-the points of connection to the statorWinding as to increase the number of convolutions'between the points ofconnectionll and 1 5' thereto respectively of the supply circuit andofthe connector 16 Withoutchanging the ratio of the convolution betweenthe said points to the convolutions between the points of connection 15and 13 respectively of the connector 16 and the commutator brushesthereto. The carrying of apart of the load by the auxiliary machine andthe ability to regulate theroportion of the load carried by it, is a higly important feature of the present invention since, by properregulation, the auxiliary machine may be caused to convert all of theelectrical energy of the secondary circuit of tlie'inductio'n. motorinto mechanical energy that is applied to the driving of the load, sothatno energy is returned to the line and the. efliciencyof the systemis materially improved. For operation above synchronism, it is best toemploy the auxiliary machine only as a frequency changer. r If desired,he stator of the auxiliaryma 'chine may be provided, as shown in Fig.2,. with two stator windings 18 and 19thata re inductively related sothat the stator may serve as a two Winding transformer rather than as anautotransformer, as in Fig.1.

This arrangement has the advantage that the vectors respectively'representing the,

voltages-applied to the field and armature-i may be independentlyregulated. 7

It Will be noted that the present system involves theemployment of but avery small number of parts, and is extremely simple, the simplicity ofthe system being due to the mechanical coupling together of the machinesand to the ,fact that the stator winding of theauxiliarymachineservesthe function of ai'transfor ner in addition t0=that of a field Winding,thereby obviating the neces' sity-. ofemploying a separate transformer-Notwith or voltage .i 'egu'lating' device. standing thefsiinplicity ofthe system, it em bodies meansflfor" separately regulating the speed ofthe induction motor, the power fac tor of the motor and of the-system,and the proportionof the load ca i'ied by the auxiliary machine. Thestator Winding .ofthe auxiliary machine may, of course, be connected,arranged anc'lproportioned so that the auxiliary machine will have theproper characteristics for any desired service conditions, and thestator may be provided in the usual manner 7 with any compensating orconiniutating windings that may be necessaryoi' desirable-to obtainproper field form and good-.

commutation, all \vithinthe spirit of theinvention. p

I claim as my invention: 1

-1. In a system of distribution, the conibi-' nationnvith a supplycircuit, and an induction motor supplied thereform, of an auxiliarymachine mechanically coupled to the induction motor and electricallyconnectedthereto and to the supply circuit, the said auxiliary machinecomprising a distributed f eld winding having a. plurality of phasedivisions, an armature having a commutator cylinder and slip rings,brushes engaging] said commutator cylindercorrespondin in number to thephase divisions of the field inding and respectively connected thereto,:

and means for varying the lengths'of the active portions of the severalphase divisions of the field Winding. o

2. In a system of distribution, the combination with a supply circuit,and an induction motor suppliedthereform, of an auxiliary machinemechanically coupled to the induction motor and electrically connectedthereto and to thesupply circuit, the saidauxiliary machine comprising.a distributed .field Winding having a pluralityofiphase divisions, anarmature having a commutator .cylinder and slip rings, brushes engagingsaid commutator cylinder corresponding in number to the phase divisionsof the field Winding and respectively connected thereto, and means forvarying the lengths and relative positions of the active portions of theseveral .phasedivisions of the field winding. 3.- In a system ofdistribution, the combi; nation with a supply circuit, and an inductionmotor supplied tlierefornnof an auxiliary machine mechanically coupledto the induction motor and electrically connected thereto and to thesupply circuit, the said auxiliary machine comprising a distributedfield' yinding having a plurality of phase. -.divi'sio'ns,,an armaturehaving a commutator ISO - winding and respectively'connect'ed thereto,

cylinder and slip rings, brushes engaging In izestimony whereof Ihaveihereunt o' said commutator cylinder corresponding 1n subscribed mynarne this 31st day of Dec em 7 number to the phase divisions of the field ber 1912. i

' FRIEDRICH W. MEYER.

and means for varying the relative positions *Witnes ses:

of the active pprtions of the several phase OTTO S. SG AIRER, divisionsof the field winding. y B. B. HINES;

